What is the volume of 20 volume $H_{2} O_{2}$ required to get 5000 $c m^{3}$ of oxygen at STP ?

250 c m^{3}

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20 c m^{3}

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100 c m^{3}

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125 c m^{3}

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Solution

The correct option is D $250 c m^{3}$
20 volume of $H_{2} O_{2}$ = $1 m L$ of $H_{2} O_{2}$ gives 20 mL of oxygen on decomposition.
∴ For $5000 c m^{3}$ of $O_{2}$ required = $\frac{5000}{20}$ = $250 c m^{3}$

Hence,option A is correct.

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